Strategic decision making is part of a strategic manager's day-to-day work and this would be part of normal development. The operation of Gold command is just like that that any business would put in place in an emergency - example a strike, a fire that has put the factory out of commission, a major flooding incident (been to such meetings as a FRS rep with only three Emergency Service personnel out of 20 at the meeting - they other managed rather well), a sudden failure of equipment (maybe a production line), a major financial problem.....the list is potentially endless. All of these require the same skill level and is taught/developed over the career of the manager. There are modules to assist such a person to understand the operational aspects, but there are alos operational personnel to advise.
Do you think that the emergency meetings at any of the above REQUIRED the managers to understnad the operational task, or could they cope with providing strategic support by utilising the knowldege and skills of their subordinates? The answer is in the way everyone else manages.
As it clearly doesn't take a few days to gain this skill then no person could walk in 'off the street' without already being a highly skilled strategic manager, I rather think that answers the pijtnb you were trying to score on the firefighter role.
As to the three Qs -
No1 - I thought you had, I can't see choice mentioned by anyone else, but am happy that you seem not to think there can be a choice - as there isn't nor has anyone suggested that modernisation is about offering the customer a choice, after all there is only one FRS still and no sign of alternatives!
No2 - Well, despite the wordings in your other posts, that you WERE a senior manager should still raise the same question. Gold command has never been different, however we did have CFOs/DCFOs/ACFOs still taking OPERATIONAL command. All that has changed is that the fire service standards now make clear that this is not their role, as it should not have been.
Q3 - The role is as it was, just clarified. Senior managers, from whatever organisation should understand the development routes that senior managers require, or can access. They should laso be able to find out such information should they not have it to hand, that you hadn't/couldn't is what I found mildly surprising. Out of interest the FSC is one, there are so many others. The only difference as it stands is the FSC is no longer THE way for the FRS.